STEPPII-55/56-LT H
ARDWARE
DESCRIPTION
V
ERSION
1.01
4.4 Technical specifications of GPS receiver
GPS features:
O
EM single board 12 channel GPS receiver, L1 1575.42
MHz, C/A code 1,023 MHz chip rate.
G
PS receiver with SiRFstarIIe/LP chip set
P
rocessor type ARM7/TDMI
S
iRF GSW2, version 2.20 (adapted for tracking
solutions).
Accuracy:
P
osition 10 meters CEP without SA.
V
elocity 0.1 meters/second, without SA
T
ime 1 microsecond synchronized to GPS time
DGPS Accuracy:
P
osition 1 to 5 meters, typical
V
elocity 0.05 meters/second, typical
Datum:
W
GS-84.
Acquisition Rate:
H
ot start <8 sec, average
W
arm start <38 sec, average
C
old start <45 sec, average
Dynamic Conditions:
A
ltitude 18,000 meters (60,000 feet) max.
V
elocity <515 meters/second (1000 knots) max.
A
cceleration 4 g, max.
J
erk 20 meters/second³, max.
Casing:
Fully shield
Time – 1 PPS Pulse:
L
evel
CMOS.
P
ulse duration 100 ms
T
ime reference At the pulse positive edge
M
easurements Aligned to GPS second, ±
µ
s
Supported protocols:
N
MEA Msg.: GLL, GGA, RMC, VTG, GSV, GSA
External antenna:
S
eparate GPS antenna connector. See figure 37 for
details
Memory:
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.
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